More than 150 million Americans are under the highest level extreme heat alerts during a wave of above-average temperatures.

After topping 90 degrees June 21 for the first time this year, temperatures in Indianapolis will continue to climb for the next two days.

"A dangerous, widespread heat wave will bake the central and eastern U.S., bringing the hottest temperatures of the year and uncomfortably muggy air to the Midwest and Northeast that in some areas could last into much of next week,

Heat doesn’t just mean canceled events. It also poses a health risk. If you can’t afford to cool the whole house, make a “cool space” to sleep in.

An expert has tips on how to stay cool during the extreme heat in Pittsburgh. Heat is the leading weather-related cause of death nationwide, surpassing the fatalities caused by floods, tornadoes, hurricanes,

With temperatures set to skyrocket into triple digits Tuesday, here are some ways to cool down in the Boston area. National Weather Service forecasts show the region may reach a dangerous record-setting high of 102 degrees as the heat emergency peaks Tuesday.